DG-33: What are the metering and interconnection requirements for solar thermal projects?

All systems presented as part of a Proposal for the Utility DG RFP must be distributed generation systems. As defined in the IPA Act, this requires that the system be:

  • Interconnected at the distribution system level of either an electric utility, alternative retail electric supplier, municipal utility, or a rural electric cooperative;
  • Located on the customer side of the customer’s electric meter and is primarily used to offset that customer’s electricity load; and
  • Limited in nameplate capacity to no more than 2,000 kW.

The interconnection requirements are the same for all technologies, including solar thermal projects. A solar thermal system that does not meet there interconnection requirements is not considered a distributed generation system and cannot be presented as part of a Proposal for the Utility DG RFP.


At this time, we can only confirm that GATS is able to register solar thermal projects. Consistent with the metering requirements set forth in the metering accuracy standards released by the IPA, systems must utilize a meter that meets ANSI C.12 Standards. Systems 25 kW and above must have a meter that was new as of the time of the installation of the system while systems under 25 kW may utilize meters that are refurbished (and certified by the meter supplier.

Please note that production estimates are not allowed and all output used to create RECs must be measured.